High-Temperature Oxidation Behavior of Two Nickel-Based Superalloys Produced by Metal Injection Molding for Aero Engine Applications

Albert, Benedikt; Völkl, Rainer; Glatzel, Uwe

doi:10.1007/s11661-014-2391-1

Cited by 24 publications

(13 citation statements)

References 25 publications

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“…It is also observed that the oxidation of the substrate resulted in a γ′-depleted layer (i.e. without any γ′ particles) as usually observed in the literature [27]. The two layers of the oxide scale are separated by discrete inclusions of tantalum and titanium oxides (bright spots in the backscattered electron image).…”

Section: Isothermal and Cyclic Oxidationsupporting

confidence: 73%

High temperature durability of a bond-coatless plasma-sprayed thermal barrier coating system with laser textured Ni-based single crystal substrate

Kromer

Cormier

Costil

et al. 2018

Surface and Coatings Technology

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Thermal barrier coating systems are usually build-up with bond coats to ensure a good adhesion of the ceramic top coat and to protect the substrate against oxidation and corrosion. Such system is often subjected to complex thermo-mechanical loading. Because of the very different damage processes encountered during service operations, a simplified system was investigated by removing the bond-coat. Recently adhesion bond strength was enhanced using laser surface texturing of the substrate in thermal spraying processes. Atmospheric plasma spray yttria-stabilized-zirconia thermal barrier coating system was deposited on the Ni-based AM1 single crystalline superalloy without bond coat. Adhesion bond strength was already increased compared to conventional processing method. Top coat durability was evaluated at high temperature and damage mechanisms were studied. Isothermal and cyclic oxidation tests showed durability of 1000 h and 400 cycles at 1100°C. The oxidation mechanisms at the substrate/top coat interface changed due to fast solidification during the laser texturing process. Then, TBC system was studied under high temperature mechanical solicitation in tension creep. The textured interfaces were not damaged after 1% creep strain while top-coat/substrate interfacial cracking was observed for grit-blasted specimens. Moreover, no preferential crack development in the substrate was observed. Patterns provided an enhanced adhesion by changing the stress distribution near the interface.

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Section: Isothermal and Cyclic Oxidationsupporting

confidence: 73%

High temperature durability of a bond-coatless plasma-sprayed thermal barrier coating system with laser textured Ni-based single crystal substrate

Kromer

Cormier

Costil

et al. 2018

Surface and Coatings Technology

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show abstract

“…The values are in the 10 À14 to 10 À12 g À2 cm À4 s À1 range from 800°C up to 1000°C, respectively, which is in good agreement with the values reported by Hindam and Whittle [19] as well as other authors. [7,[20][21][22][23] It was shown that the small modification of the MAR-M246 chemistry undertaken in the present work, i.e., substitution of Ta by Nb, has not induced a significant effect on the oxidation kinetics at 800°C and 900°C. The average parabolic constants determined from the batch of 3 samples of each alloy are in the same order of magnitude.…”

Section: Discussionmentioning

confidence: 61%

High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy

Alkmin

Chaia

Utada

et al. 2021

Metall Mater Trans A

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The present investigations focused on the thermal oxidation of two variants of MAR-M246 alloy having the same contents of Ta and Nb in at. pct, considering the effects of total replacement of Ta by Nb. The alloys were produced by investment casting using high purity elements in induction furnace under vacuum atmosphere. The alloys were oxidized pseudo-isothermally at 800°C, 900°C and 1000°C up to 1000 hours under lab air. Protective oxidation products growing on the surface of the oxidized samples were mainly Al 2 O 3 , Cr 2 O 3 . Other less protective oxide such as spinels (NiCr 2 O 4 and CoCr 2 O 4 ) and TiO 2 were also detected as oxidation products. The conventional alloy exhibited slight internal oxidation at 800°C and an enhanced resistance at 900°C and 1000°C. The Nb-modified alloy presented an exacerbated internal oxidation and nitridation at 900°C and 1000°C and an enhanced resistance at 800°C. At 1000°C, Nb-modified alloy was particularly affected by excessive spalling as the main damage mechanisms. From a kinetic point of view, both alloys exhibit the same behavior at 800°C and 900°C, with k p values typical of alumina forming alloys (2 9 10 À14 to 3.6 9 10 À13 g 2 cm À4 s À1 ). However, Ta modified alloys exhibited superior oxidation resistance at 1000°C when compared to the Nb modified alloy due to better adherence of the protective oxide scale.

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“…The lattice diffusion coefficient of Ni ions in the Cr 2 O 3 film is reported two orders of magnitude higher than that of Cr ions [22] and it is easy to understand the formation of NiCr 2 O 4 spinel follows the appearance of NiO in dynamics aspect. It can be concluded that the formation of NiO is a transaction stage [19,23] in the oxidation process of Inconel 740H and it eventually transfers to NiCr 2 O 4 spinel.…”

Section: Cross-sectional Morphologies Characterizationmentioning

confidence: 99%

Oxidation Behavior and Mechanism of Inconel 740H Alloy for Advanced Ultra-supercritical Power Plants Between 1050 and 1170 °C

et al. 2015

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The oxidation behavior and mechanism of as-cast Inconel 740H superalloy, newly developed for advanced ultra-supercritical power plants superheater and reheater pipes, were investigated in the temperature range of 1050-1170°C in air. Isothermal oxidation testing, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy were used in this study. The results showed that the oxidation of Inconel 740H was a diffusion-controlled process and controlled by the outward diffusion of metallic elements and inward penetration of oxygen. Owing to the complicated chemical composition of the alloy, different oxides tended to form in the oxidation process. Cross-sectional characterization investigation indicated that the oxide-scale layer consisted of three parts when the temperature was high or the oxidation time was long: an internal oxidation zone composed of Al 2 O 3 and TiO 2 , a continuous and dense middle layer of Cr 2 O 3 containing precipitates of TiO 2 and an outmost layer of NiCr 2 O 4 spinel. In the formation process of NiCr 2 O 4 , NiO was found in the early transient stage. With further oxidation, TiO 2 finally could not be detected in the internal oxidation zone as a result of outwards diffusion of Ti and its limited concentration in the matrix.

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High-Temperature Oxidation Behavior of Two Nickel-Based Superalloys Produced by Metal Injection Molding for Aero Engine Applications

Cited by 24 publications

References 25 publications

High temperature durability of a bond-coatless plasma-sprayed thermal barrier coating system with laser textured Ni-based single crystal substrate

High temperature durability of a bond-coatless plasma-sprayed thermal barrier coating system with laser textured Ni-based single crystal substrate

High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy

Oxidation Behavior and Mechanism of Inconel 740H Alloy for Advanced Ultra-supercritical Power Plants Between 1050 and 1170 °C

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